Dissipationless Spin Current Generation in Kitaev's Chiral Spin Liquid

Abstract

$\alpha$-RuCl${}_3$ is a promising candidate material for the Kitaev spin liquid state where the half quantization of the thermal Hall effect, suggesting a topological character, has been observed. However, its relation to the existence of chiral Majorana fermions, which is predicted from the theory of the Kitaev model, is still under debate. Here we propose a more direct signature of a chiral Majorana edge mode which emerges in a universal scaling of the Drude weight of the edge spin Seebeck effect in the Kitaev model. Moreover, the absence of backscatterings in the chiral edge mode results in the generation of a dissipationless spin current in spite of an extremely short spin correlation length close to a lattice constant in the bulk. This result is not only experimentally observable, but also opens a way towards spintronics application of Kitaev materials. In contrast to magnetically ordered systems, a Kitaev spin liquid state is stable even in the atomic scale and makes it possible to fabricate a highly integrated device with substantial efficiency to generate a spin current. This proposal for using $\alpha$-RuCl${}_3$ as a nano-scale device will pioneer Kitaev spintronics.

arXiv comment8 pages, 4 figures

References in corpus (59)

• Anyons in an exactly solved model and beyond
• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Universal Intrinsic Spin-Hall Effect
• Time-dependent transport in interacting and non-interacting mesoscopic systems
• Direct electronic measurement of the spin Hall effect
• Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
• Majorana quantization and half-integer thermal quantum Hall effect in a Kitaev spin liquid
• Proximate Kitaev Quantum Spin Liquid Behaviour in α-RuCl${}_3$
• $\alpha$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice
• Generic spin model for the honeycomb iridates beyond the Kitaev limit
• The monoclinic crystal structure of $\alpha$-RuCl${}_3$ and the zigzag antiferromagnetic ground state
• Exact results for spin dynamics and fractionization in the Kitaev Model
• Low-temperature crystal and magnetic structure of $\alpha$-RuCl3
• Direct evidence of a zigzag spin chain structure in the honeycomb lattice: A neutron and x-ray diffraction investigation on single crystal $\mathrm{N}{\mathrm{a}}_2\mathrm{Ir}{\mathrm{O}}_3$
• Evidence for a Field-induced Quantum Spin Liquid in $\alpha$-RuCl${}_3$
• Dynamics of a two-dimensional quantum spin liquid: signatures of emergent Majorana fermions and fluxes
• Long range magnetic ordering in Na${}_2$IrO${}_3$
• Successive magnetic phase transitions in $\mathbf{\alpha }$-RuCl${}_3$: XY-like frustrated magnet on the honeycomb lattice
• Half-integer quantized anomalous thermal Hall effect in the Kitaev material $\alpha$-RuCl${}_3$
• Linear-response theory of spin Seebeck effect in ferromagnetic insulators
• Thermal fractionalization of quantum spins in a Kitaev model: $T$-linear specific heat and coherent transport of Majorana fermions
• Observation of the spin Peltier effect
• Gapless Spin Excitations in the Field-Induced Quantum Spin Liquid Phase of alpha-RuCl3
• First-Principles Study of the Honeycomb-Lattice Iridates Na2IrO3 in the Presence of Strong Spin-Orbit Interaction and Electron Correlations
• Large field-induced gap of Kitaev-Heisenberg paramagnons in $\alpha$-RuCl${}_3$
• Incommensurate Counterrotating Magnetic Order Stabilized by Kitaev Interactions in the Layered Honeycomb $\alpha$-Li${}_2$IrO${}_3$
• Thermal imaging of spin Peltier effect
• Observation of spin current in quantum spin liquid
• Observation of two types of anyons in the Kitaev honeycomb magnet
• Thermal Transport in the Kitaev Model
• Sample dependence of the half-integer quantized thermal Hall effect in the Kitaev candidate $\alpha$-RuCl${}_3$
• Quantization of the thermal Hall conductivity at small Hall angles
• Theory of the field-revealed Kitaev spin liquid
• Robust non-Abelian spin liquid and possible intermediate phase in antiferromagnetic Kitaev model with magnetic field
• Low-energy Spin Dynamics of the Honeycomb Spin Liquid Beyond the Kitaev Limit
• Cross-Correlated Responses of Topological Superconductors and Superfluids
• Approximately quantized thermal Hall effect of chiral liquids coupled to phonons
• Quantum spin liquid with a Majorana Fermi surface on the three-dimensional hyperoctagon lattice
• Quantum Thermal Hall Effect in a Time-Reversal-Symmetry-Broken Topological Superconductor in Two Dimensions : Approach From Bulk Calculations
• Designing Kitaev spin liquids in metal-organic frameworks
• Drude Weight at Finite Temperatures for Some Non-Integrable Quantum Systems in One Dimension
• Irrelevant operators in the two-dimensional Ising model
• Impact of off-diagonal exchange interactions on the Kitaev spin liquid state of $\alpha$-RuCl${}_3$
• Kitaev-like honeycomb magnets: Global phase behavior and emergent effective models
• Spin-Peierls Instability of Three-Dimensional Spin Liquids with Majorana Fermi Surfaces
• Majorana-mediated spin transport without spin polarization in Kitaev quantum spin liquids
• Vison Crystals in an Extended Kitaev Model on the Honeycomb Lattice
• Crystalline Kitaev spin liquids
• Disorder upon disorder: localization effects in the Kitaev spin liquid
• Edge magnetization and spin transport in an SU(2)-symmetric Kitaev spin liquid
• Anderson-Kitaev spin liquid
• Vison-Majorana complex zero-energy resonance in Kitaev's spin liquid
• Nonequilibrium Majorana Dynamics by Quenching a Magnetic Field in Kitaev Spin Liquids
• Topological phase transition to Abelian anyon phases due to off-diagonal exchange interaction in the Kitaev spin liquid state
• Majorana edge magnetization in the Kitaev honeycomb model
• Topological $Z_2$ invariant in Kitaev spin liquids: Classification of gapped spin liquids beyond projective symmetry group
• Topological Nematic Phase Transition in Kitaev Magnets Under Applied Magnetic Fields
• Oriented propagation of magnetization due to chiral edge modes in Kitaev-type models
• Electric probe for the toric code phase in Kitaev materials through the hyperfine interaction

Cited by in corpus (8)

• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Non-local spin correlation as a signature of Ising anyons trapped in vacancies of the Kitaev spin liquid
• Scattering phenomena for spin transport in Kitaev spin liquid
• Field-driven spatiotemporal manipulation of Majorana zero modes in a Kitaev spin liquid
• Interedge spin resonance in the Kitaev quantum spin liquid
• Spin Seebeck Effect as a Probe for Majorana Fermions in Kitaev Spin Liquids
• Nonreciprocal heat transport in the Kitaev chiral spin liquid
• Fidelity of the Kitaev honeycomb model under a quench